Debian mirroring problem

Sorry for using English, cause my fcitx acts funny.

I've been setting up an Debian x86 mirror site locally. I wrote a simple script and put it in /etc/cron.daily/. It's shown below:

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wx672@cisd-ftp:~$ cat /etc/cron.daily/debmirror
#!/bin/sh

test -x /usr/bin/debmirror || exit 0

/usr/bin/debmirror --ignore-release-gpg --ignore-missing-release --nosource -h debian.cn99.com --method=http --section=main,contrib,non-free,main/debian-installer --root=/debian --dist=sid,sarge -a i386 /home/ftp/debian &

/usr/bin/debmirror --ignore-release-gpg --ignore-missing-release --nosource -h debian.cn99.com --method=http --section=main,contrib,non-free --root=/debian-non-US --dist=sid/non-US,sarge/non-US -a i386 /home/ftp/debian-non-US &

/usr/bin/debmirror --ignore-release-gpg --ignore-missing-release --nosource -h debian.cn99.com --method=http --section=main,contrib,non-free --root=/debian-security --dist=sarge/updates -a i386 /home/ftp/debian-security &

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It works, and the mirror is built up there but with some problems. I get a cron mail everyday, shows that some packages can not be found. Can anyone give ma a clue? Thanks.

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Errors:
Download of pool/main/m/mysql-dfsg-4.1/mysql-server-4.1_4.1.11-1_i386.deb failed: 404 Not Found
+Download of pool/main/n/nfs-utils/nfs-common_1.0.7-3_i386.deb failed: 404 Not Found Download of
+pool/main/n/nfs-utils/nfs-kernel-server_1.0.7-3_i386.deb failed: 404 Not Found Download of
+pool/main/n/nfs-utils/nhfsstone_1.0.7-3_i386.deb failed: 404 Not Found Download of
+pool/main/n/nsis/nsis_2.06-2_i386.deb failed: 404 Not Found Download of
+pool/main/o/okle/okle_0.4+cvs20040728-1_i386.deb failed: 404 Not Found Download of
+pool/main/p/paje.app/paje.app_1.3.2-3_i386.deb failed: 404 Not Found Download of
+pool/main/p/php4-kadm5/php4-kadm5_0.2.4-1_i386.deb failed: 404 Not Found Download of
+pool/main/p/phpqladmin/phpqladmin_2.2.2-1_all.deb failed: 404 Not Found Download of
+pool/main/p/po-debconf/po-debconf_0.8.23_all.deb failed: 404 Not Found Download of
+pool/main/p/polyxmass-common/polyxmass-common_0.8.5-1_all.deb failed: 404 Not Found Download of
+pool/main/p/polyxmass-data/polyxmass-data_0.8.4-1_all.deb failed: 404 Not Found Download of
+pool/main/p/polyxmass-doc/polyxmass-doc_0.8.5-1_all.deb failed: 404 Not Found Download of
+pool/main/p/polyxmass/polyxmass_0.8.7_all.deb failed: 404 Not Found Download of
+pool/main/p/puredata/puredata_0.38.4+amidi-3_i386.deb failed: 404 Not Found Download of
+pool/main/p/python-visual/python-visual_3.1.1-4_i386.deb failed: 404 Not Found Download of
+pool/main/q/qucs/qucs_0.0.5-1_i386.deb failed: 404 Not Found Download of
+pool/main/r/renameutils/renameutils_0.5.1-3_i386.deb failed: 404 Not Found Download of
+pool/main/r/request-tracker3.4/request-tracker3.4_3.4.1-2_all.deb failed: 404 Not Found Download
+of pool/main/r/request-tracker3.4/rt3.4-clients_3.4.1-2_all.deb failed: 404 Not Found Download of
+pool/main/r/rrootage/rrootage-data_0.23a-2_all.deb failed: 404 Not Found Download of
+pool/main/r/rrootage/rrootage_0.23a-2_i386.deb failed: 404 Not Found Download of
+pool/main/s/shapelib/libshp-dev_1.2.10-2_i386.deb failed: 404 Not Found Download of
+pool/main/s/shapelib/libshp1_1.2.10-2_i386.deb failed: 404 Not Found Download of
+pool/main/s/shapelib/shapelib_1.2.10-2_i386.deb failed: 404 Not Found Download of
+pool/main/s/sound-juicer/sound-juicer_0.6.1-1_i386.deb failed: 404 Not Found

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